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You need to find out why you have low oil pressure. It is normal that as engine rpm's increase, the oil pressure will rise- the oil pump is moving oil faster. Even though your light goes out, you could still have critically low oil pressure. There should be sufficient pressure at idle to keep the light off. The light will come on when your oil pressure is almost nil- I believe for some it's as low as 8 psi. Normally, oil pressure at idle is specified anywhere from 15 to 40 psi. You would have to check specifications for your Expedition. To verify oil pressure, hook up a mechanical gauge at the oil pressure sending unit on the engine block. Check with a local shop.
The causes run from easy, simple to budget busting ruin. Low oil level, wrong grade oil, real old oil, oil leaks, internal oil leaks, worn oil pump, worn crankshaft bearings. It was pretty common on older very high mileage cars to have a fluttering oil light at stops and idle. It was time for a rebuild, or time to look for another car.
check the oil level and condition. Change it if it looks black or too thick. Have a mechanical oil gauge fitted to check that the electrical gauge is correct because the problem may be in the oil pressure sender unit. Check the viscosity of the oil used as now you should be down to the 15w30 range for the cold weather.
SOUND LIKE FRONT CRANKSHAFT TIMING COVER SEAL OR REAR MAIN OIL SEAL LEAKING START ENGINE LET IT IDLE SEE IF YOU SEE OIL DRIPPING UNDERNEATH CAR LOOK FOR OIL LEAK AT TIMING COVER OR AT REAR OF ENGINE WHERE REAR MAIN SEAL LOCATED. CHECK ON TOP OF ENGINE INTAKE MANIFOLD AREA WHERE OIL PUMP DRIVE GEAR IS.O - RING AT THE OIL PUMP DRIVE GEAR WILL CAUSE LARGE OIL LEAK.OIL PUMP DRIVE GEAR IS LOCATED WHERE THE DISTRIBUTOR USE TO BE LOCATED.KEEP EYE ON OIL LEVEL IN CRANK CASE.KEEP PLENTY ENGINE OIL ON HAND UNTIL YOU FIX.I WOULD FIND LOCATE PROBLEM QUICK AS POSSIBLE BECAUSE OIL LEVEL GET TOO LOW ENGINE WILL SEIZE UP LACK OF OIL..
The cylinder head is located on the center of the engine. Yes it can be a worn out head gasket or piston rings. If the piston rings are worn out the oil is burnt that's why it emits white smoke. You will need to replace the head gasket and piston rings.
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If your carb has one, check the idle cut-off solenoid wiring and operation first. If that checks out your idle jet is either blocked or the volume adjustment screw is out of adjustment. Start with the volume adjustment screw by turning it all the way in (counting the number of turns it took) and then turning it out about three turns. See if you can get the engine to idle at that setting or somewhere near that. If that does not work, replace the screw to the original position and remove the idle jet and ensure that it is not clogged.
I would keep an eye closely on the oil and coolant. You want to make sure the coolant is not getting into the combution chamber. (Due to a bad head gasket or a crack) Normally white smoke is due to coolant mixed with oil, but...some moisture will look white for a couple seconds when cold. So... keep a good eye on fluids, and if you see a level going down, get it checked out.
Black smoke tells me your piston rings are worn. Also the fumes you have explained tells me the valve seals are worn and leaking oil as well
The leaking valve seals and pistion rings will expell the fumes out through the exhaust. If you check your oil level every 50 miles and the oil level is down a half quart or more serious engine wear has occured and needs to be rebuilt soon
Sounds like a miss fire, try a tune up if its been a while since your last one. Plugs wires air filter, etc.
Look at your exhaust with the car idling, if its dark grey then you have unburnt fuel in your exhaust and a tuneup is a good place to start. If it is blueish grey then you are probably burning oil and may need an intake gasket or valve seals.
Also check your fluid levels, especially coolant and oil. if the oil level is high and the coolant is low you may have a deeper issue and may need to take it to a repair shop.
Did this problem start suddenly or after an oil change or top up. Your oil level might be too high, if so the surplus will burn off. If it happens on start up or long idle periods but goes away during normal running could be valve guides or seals.